src/host/layer23/src/mobile/mnccms.c

   1 /*
   2  * (C) 2010 by Andreas Eversberg <jolly@eversberg.eu>
   3  *
   4  * All Rights Reserved
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  */
  21
  22 #include <stdint.h>
  23 #include <errno.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <stdlib.h>
  27
  28 #include <osmocore/talloc.h>
  29
  30 #include <osmocom/bb/common/logging.h>
  31 #include <osmocom/bb/common/osmocom_data.h>
  32 #include <osmocom/bb/mobile/mncc.h>
  33 #include <osmocom/bb/mobile/vty.h>
  34
  35 void *l23_ctx;
  36 static uint32_t new_callref = 1;
  37 static LLIST_HEAD(call_list);
  38
  39 /*
  40  * support functions
  41  */
  42
  43 void mncc_set_cause(struct gsm_mncc *data, int loc, int val);
  44
  45 static void free_call(struct gsm_call *call)
  46 {
  47         llist_del(&call->entry);
  48         DEBUGP(DMNCC, "(call %x) Call removed.\n", call->callref);
  49         talloc_free(call);
  50 }
  51
  52
  53 struct gsm_call *get_call_ref(uint32_t callref)
  54 {
  55         struct gsm_call *callt;
  56
  57         llist_for_each_entry(callt, &call_list, entry) {
  58                 if (callt->callref == callref)
  59                         return callt;
  60         }
  61         return NULL;
  62 }
  63
  64 static int8_t mncc_get_bearer(struct gsm_settings *set, uint8_t speech_ver)
  65 {
  66         switch (speech_ver) {
  67         case 4:
  68                 if (set->full_v3)
  69                         LOGP(DMNCC, LOGL_INFO, " net suggests full rate v3\n");
  70                 else {
  71                         LOGP(DMNCC, LOGL_INFO, " full rate v3 not supported\n");
  72                         speech_ver = -1;
  73                 }
  74                 break;
  75         case 2:
  76                 if (set->full_v2)
  77                         LOGP(DMNCC, LOGL_INFO, " net suggests full rate v2\n");
  78                 else {
  79                         LOGP(DMNCC, LOGL_INFO, " full rate v2 not supported\n");
  80                         speech_ver = -1;
  81                 }
  82                 break;
  83         case 0: /* mandatory */
  84                 if (set->full_v1)
  85                         LOGP(DMNCC, LOGL_INFO, " net suggests full rate v1\n");
  86                 else {
  87                         LOGP(DMNCC, LOGL_INFO, " full rate v1 not supported\n");
  88                         speech_ver = -1;
  89                 }
  90                 break;
  91         case 5:
  92                 if (set->half_v3)
  93                         LOGP(DMNCC, LOGL_INFO, " net suggests half rate v3\n");
  94                 else {
  95                         LOGP(DMNCC, LOGL_INFO, " half rate v3 not supported\n");
  96                         speech_ver = -1;
  97                 }
  98                 break;
  99         case 1:
 100                 if (set->half_v1)
 101                         LOGP(DMNCC, LOGL_INFO, " net suggests half rate v1\n");
 102                 else {
 103                         LOGP(DMNCC, LOGL_INFO, " half rate v1 not supported\n");
 104                         speech_ver = -1;
 105                 }
 106                 break;
 107         default:
 108                 LOGP(DMNCC, LOGL_INFO, " net suggests unknown speech version "
 109                         "%d\n", speech_ver);
 110                 speech_ver = -1;
 111         }
 112
 113         return speech_ver;
 114 }
 115
 116 static void mncc_set_bearer(struct osmocom_ms *ms, int8_t speech_ver,
 117         struct gsm_mncc *mncc)
 118 {
 119         struct gsm_settings *set = &ms->settings;
 120         int i = 0;
 121
 122         mncc->fields |= MNCC_F_BEARER_CAP;
 123         mncc->bearer_cap.coding = 0;
 124         if (set->ch_cap == GSM_CAP_SDCCH_TCHF_TCHH
 125          && (set->half_v1 || set->half_v3)) {
 126                 mncc->bearer_cap.radio = 3;
 127                 LOGP(DMNCC, LOGL_INFO, " support TCH/H also\n");
 128         } else {
 129                 mncc->bearer_cap.radio = 1;
 130                 LOGP(DMNCC, LOGL_INFO, " support TCH/F only\n");
 131         }
 132         mncc->bearer_cap.speech_ctm = 0;
 133         /* if no specific speech_ver is given */
 134         if (speech_ver < 0) {
 135                 /* if half rate is supported and prefered */
 136                 if (set->half_v3 && set->half && set->half_prefer) {
 137                         mncc->bearer_cap.speech_ver[i++] = 5;
 138                         LOGP(DMNCC, LOGL_INFO, " support half rate v3\n");
 139                 }
 140                 if (set->half_v1 && set->half && set->half_prefer) {
 141                         mncc->bearer_cap.speech_ver[i++] = 1;
 142                         LOGP(DMNCC, LOGL_INFO, " support half rate v1\n");
 143                 }
 144                 /* if full rate is supported */
 145                 if (set->full_v3) {
 146                         mncc->bearer_cap.speech_ver[i++] = 4;
 147                         LOGP(DMNCC, LOGL_INFO, " support full rate v3\n");
 148                 }
 149                 if (set->full_v2) {
 150                         mncc->bearer_cap.speech_ver[i++] = 2;
 151                         LOGP(DMNCC, LOGL_INFO, " support full rate v2\n");
 152                 }
 153                 if (set->full_v1) { /* mandatory, so it's always true */
 154                         mncc->bearer_cap.speech_ver[i++] = 0;
 155                         LOGP(DMNCC, LOGL_INFO, " support full rate v1\n");
 156                 }
 157                 /* if half rate is supported and not prefered */
 158                 if (set->half_v3 && set->half && !set->half_prefer) {
 159                         mncc->bearer_cap.speech_ver[i++] = 5;
 160                         LOGP(DMNCC, LOGL_INFO, " support half rate v3\n");
 161                 }
 162                 if (set->half_v1 && set->half && !set->half_prefer) {
 163                         mncc->bearer_cap.speech_ver[i++] = 1;
 164                         LOGP(DMNCC, LOGL_INFO, " support half rate v1\n");
 165                 }
 166         /* if specific speech_ver is given (it must be supported) */
 167         } else
 168                 mncc->bearer_cap.speech_ver[i++] = speech_ver;
 169         mncc->bearer_cap.speech_ver[i] = -1; /* end of list */
 170         mncc->bearer_cap.transfer = 0;
 171         mncc->bearer_cap.mode = 0;
 172 }
 173
 174 /*
 175  * MNCCms dummy application
 176  */
 177
 178 /* this is a minimal implementation as required by GSM 04.08 */
 179 int mncc_recv_dummy(struct osmocom_ms *ms, int msg_type, void *arg)
 180 {
 181         struct gsm_mncc *data = arg;
 182         uint32_t callref = data->callref;
 183         struct gsm_mncc rel;
 184
 185         if (msg_type == MNCC_REL_IND || msg_type == MNCC_REL_CNF)
 186                 return 0;
 187
 188         LOGP(DMNCC, LOGL_INFO, "Rejecting incomming call\n");
 189
 190         /* reject, as we don't support Calls */
 191         memset(&rel, 0, sizeof(struct gsm_mncc));
 192         rel.callref = callref;
 193         mncc_set_cause(&rel, GSM48_CAUSE_LOC_USER,
 194                 GSM48_CC_CAUSE_INCOMPAT_DEST);
 195
 196         return mncc_send(ms, MNCC_REL_REQ, &rel);
 197 }
 198
 199 /*
 200  * MNCCms basic call application
 201  */
 202
 203 int mncc_recv_mobile(struct osmocom_ms *ms, int msg_type, void *arg)
 204 {
 205         struct gsm_settings *set = &ms->settings;
 206         struct gsm_mncc *data = arg;
 207         struct gsm_call *call = get_call_ref(data->callref);
 208         struct gsm_mncc mncc;
 209         uint8_t cause;
 210         int8_t  speech_ver = -1, speech_ver_half = -1, temp;
 211         int first_call = 0;
 212
 213         /* call does not exist */
 214         if (!call && msg_type != MNCC_SETUP_IND) {
 215                 LOGP(DMNCC, LOGL_INFO, "Rejecting incomming call "
 216                         "(callref %x)\n", data->callref);
 217                 if (msg_type == MNCC_REL_IND || msg_type == MNCC_REL_CNF)
 218                         return 0;
 219                 cause = GSM48_CC_CAUSE_INCOMPAT_DEST;
 220                 release:
 221                 memset(&mncc, 0, sizeof(struct gsm_mncc));
 222                 mncc.callref = data->callref;
 223                 mncc_set_cause(&mncc, GSM48_CAUSE_LOC_USER, cause);
 224                 return mncc_send(ms, MNCC_REL_REQ, &mncc);
 225         }
 226
 227         /* setup without call */
 228         if (!call) {
 229                 if (llist_empty(&call_list))
 230                         first_call = 1;
 231                 call = talloc_zero(l23_ctx, struct gsm_call);
 232                 if (!call)
 233                         return -ENOMEM;
 234                 call->callref = data->callref;
 235                 llist_add_tail(&call->entry, &call_list);
 236         }
 237
 238         /* not in initiated state anymore */
 239         call->init = 0;
 240
 241         switch (msg_type) {
 242         case MNCC_DISC_IND:
 243                 vty_notify(ms, NULL);
 244                 switch (data->cause.value) {
 245                 case GSM48_CC_CAUSE_UNASSIGNED_NR:
 246                         vty_notify(ms, "Call: Number not assigned\n");
 247                         break;
 248                 case GSM48_CC_CAUSE_NO_ROUTE:
 249                         vty_notify(ms, "Call: Destination unreachable\n");
 250                         break;
 251                 case GSM48_CC_CAUSE_NORM_CALL_CLEAR:
 252                         vty_notify(ms, "Call: Remote hangs up\n");
 253                         break;
 254                 case GSM48_CC_CAUSE_USER_BUSY:
 255                         vty_notify(ms, "Call: Remote busy\n");
 256                         break;
 257                 case GSM48_CC_CAUSE_USER_NOTRESPOND:
 258                         vty_notify(ms, "Call: Remote not responding\n");
 259                         break;
 260                 case GSM48_CC_CAUSE_USER_ALERTING_NA:
 261                         vty_notify(ms, "Call: Remote not answering\n");
 262                         break;
 263                 case GSM48_CC_CAUSE_CALL_REJECTED:
 264                         vty_notify(ms, "Call has been rejected\n");
 265                         break;
 266                 case GSM48_CC_CAUSE_NUMBER_CHANGED:
 267                         vty_notify(ms, "Call: Number changed\n");
 268                         break;
 269                 case GSM48_CC_CAUSE_PRE_EMPTION:
 270                         vty_notify(ms, "Call: Cleared due to pre-emption\n");
 271                         break;
 272                 case GSM48_CC_CAUSE_DEST_OOO:
 273                         vty_notify(ms, "Call: Remote out of order\n");
 274                         break;
 275                 case GSM48_CC_CAUSE_INV_NR_FORMAT:
 276                         vty_notify(ms, "Call: Number invalid or imcomplete\n");
 277                         break;
 278                 case GSM48_CC_CAUSE_NO_CIRCUIT_CHAN:
 279                         vty_notify(ms, "Call: No channel available\n");
 280                         break;
 281                 case GSM48_CC_CAUSE_NETWORK_OOO:
 282                         vty_notify(ms, "Call: Network out of order\n");
 283                         break;
 284                 case GSM48_CC_CAUSE_TEMP_FAILURE:
 285                         vty_notify(ms, "Call: Temporary failure\n");
 286                         break;
 287                 case GSM48_CC_CAUSE_SWITCH_CONG:
 288                         vty_notify(ms, "Congestion\n");
 289                         break;
 290                 default:
 291                         vty_notify(ms, "Call has been disconnected\n");
 292                 }
 293                 LOGP(DMNCC, LOGL_INFO, "Call has been disconnected "
 294                         "(cause %d)\n", data->cause.value);
 295                 if ((data->fields & MNCC_F_PROGRESS)
 296                  && data->progress.descr == 8) {
 297                         vty_notify(ms, "Please hang up!\n");
 298                         break;
 299                 }
 300                 free_call(call);
 301                 cause = GSM48_CC_CAUSE_NORM_CALL_CLEAR;
 302                 goto release;
 303         case MNCC_REL_IND:
 304         case MNCC_REL_CNF:
 305                 vty_notify(ms, NULL);
 306                 if (data->cause.value == GSM48_CC_CAUSE_CALL_REJECTED)
 307                         vty_notify(ms, "Call has been rejected\n");
 308                 else
 309                         vty_notify(ms, "Call has been released\n");
 310                 LOGP(DMNCC, LOGL_INFO, "Call has been released (cause %d)\n",
 311                         data->cause.value);
 312                 free_call(call);
 313                 break;
 314         case MNCC_CALL_PROC_IND:
 315                 vty_notify(ms, NULL);
 316                 vty_notify(ms, "Call is proceeding\n");
 317                 LOGP(DMNCC, LOGL_INFO, "Call is proceeding\n");
 318                 if ((data->fields & MNCC_F_BEARER_CAP)
 319                  && data->bearer_cap.speech_ver[0] >= 0) {
 320                         mncc_get_bearer(set, data->bearer_cap.speech_ver[0]);
 321                 }
 322                 break;
 323         case MNCC_ALERT_IND:
 324                 vty_notify(ms, NULL);
 325                 vty_notify(ms, "Call is aleriting\n");
 326                 LOGP(DMNCC, LOGL_INFO, "Call is alerting\n");
 327                 break;
 328         case MNCC_SETUP_CNF:
 329                 vty_notify(ms, NULL);
 330                 vty_notify(ms, "Call is answered\n");
 331                 LOGP(DMNCC, LOGL_INFO, "Call is answered\n");
 332                 break;
 333         case MNCC_SETUP_IND:
 334                 vty_notify(ms, NULL);
 335                 if (!first_call && !ms->settings.cw) {
 336                         vty_notify(ms, "Incomming call rejected while busy\n");
 337                         LOGP(DMNCC, LOGL_INFO, "Incomming call but busy\n");
 338                         cause = GSM48_CC_CAUSE_USER_BUSY;
 339                         goto release;
 340                 }
 341                 /* select first supported speech_ver */
 342                 if ((data->fields & MNCC_F_BEARER_CAP)) {
 343                         int i;
 344
 345                         for (i = 0; data->bearer_cap.speech_ver[i] >= 0; i++) {
 346
 347                                 temp = mncc_get_bearer(set,
 348                                         data->bearer_cap.speech_ver[i]);
 349                                 if (temp < 0)
 350                                         continue;
 351                                 if (temp == 5 || temp == 1) { /* half */
 352                                         /* only the first half rate */
 353                                         if (speech_ver_half < 0)
 354                                                 speech_ver_half = temp;
 355                                 } else {
 356                                         /* only the first full rate */
 357                                         if (speech_ver < 0)
 358                                                 speech_ver = temp;
 359                                 }
 360                         }
 361                         /* half and full given */
 362                         if (speech_ver_half >= 0 && speech_ver >= 0) {
 363                                 if (set->half_prefer) {
 364                                         LOGP(DMNCC, LOGL_INFO, " both supported"
 365                                                 " codec rates are given, using "
 366                                                 "preferred half rate\n");
 367                                         speech_ver = speech_ver_half;
 368                                 } else
 369                                         LOGP(DMNCC, LOGL_INFO, " both supported"
 370                                                 " codec rates are given, using "
 371                                                 "preferred full rate\n");
 372                         } else if (speech_ver_half < 0 && speech_ver < 0) {
 373                                 LOGP(DMNCC, LOGL_INFO, " no supported codec "
 374                                         "rate is given\n");
 375                         /* only half rate is given, use it */
 376                         } else if (speech_ver_half >= 0) {
 377                                 LOGP(DMNCC, LOGL_INFO, " only supported half "
 378                                         "rate codec is given, using it\n");
 379                                 speech_ver = speech_ver_half;
 380                         /* only full rate is given, use it */
 381                         } else {
 382                                 LOGP(DMNCC, LOGL_INFO, " only supported full "
 383                                         "rate codec is given, using it\n");
 384                         }
 385                 }
 386                 /* presentation allowed if present == 0 */
 387                 if (data->calling.present || !data->calling.number[0])
 388                         vty_notify(ms, "Incomming call (anonymous)\n");
 389                 else if (data->calling.type == 1)
 390                         vty_notify(ms, "Incomming call (from +%s)\n",
 391                                 data->calling.number);
 392                 else if (data->calling.type == 2)
 393                         vty_notify(ms, "Incomming call (from 0-%s)\n",
 394                                 data->calling.number);
 395                 else
 396                         vty_notify(ms, "Incomming call (from %s)\n",
 397                                 data->calling.number);
 398                 LOGP(DMNCC, LOGL_INFO, "Incomming call (from %s callref %x)\n",
 399                         data->calling.number, call->callref);
 400                 memset(&mncc, 0, sizeof(struct gsm_mncc));
 401                 mncc.callref = call->callref;
 402                 /* only include bearer cap, if not given in setup
 403                  * or if multiple codecs are given
 404                  * or if not only full rate
 405                  * or if given codec is unimplemented
 406                  */
 407                 if (!(data->fields & MNCC_F_BEARER_CAP) || speech_ver < 0)
 408                         mncc_set_bearer(ms, -1, &mncc);
 409                 else if (data->bearer_cap.speech_ver[1] >= 0
 410                       || speech_ver != 0)
 411                         mncc_set_bearer(ms, speech_ver, &mncc);
 412                 mncc_send(ms, MNCC_CALL_CONF_REQ, &mncc);
 413                 if (first_call)
 414                         LOGP(DMNCC, LOGL_INFO, "Ring!\n");
 415                 else {
 416                         LOGP(DMNCC, LOGL_INFO, "Knock!\n");
 417                         call->hold = 1;
 418                 }
 419                 call->ring = 1;
 420                 memset(&mncc, 0, sizeof(struct gsm_mncc));
 421                 mncc.callref = call->callref;
 422                 mncc_send(ms, MNCC_ALERT_REQ, &mncc);
 423                 break;
 424         case MNCC_SETUP_COMPL_IND:
 425                 vty_notify(ms, NULL);
 426                 vty_notify(ms, "Call is connected\n");
 427                 LOGP(DMNCC, LOGL_INFO, "Call is connected\n");
 428                 break;
 429         case MNCC_HOLD_CNF:
 430                 vty_notify(ms, NULL);
 431                 vty_notify(ms, "Call is on hold\n");
 432                 LOGP(DMNCC, LOGL_INFO, "Call is on hold\n");
 433                 call->hold = 1;
 434                 break;
 435         case MNCC_HOLD_REJ:
 436                 vty_notify(ms, NULL);
 437                 vty_notify(ms, "Call hold was rejected\n");
 438                 LOGP(DMNCC, LOGL_INFO, "Call hold was rejected\n");
 439                 break;
 440         case MNCC_RETRIEVE_CNF:
 441                 vty_notify(ms, NULL);
 442                 vty_notify(ms, "Call is retrieved\n");
 443                 LOGP(DMNCC, LOGL_INFO, "Call is retrieved\n");
 444                 call->hold = 0;
 445                 break;
 446         case MNCC_RETRIEVE_REJ:
 447                 vty_notify(ms, NULL);
 448                 vty_notify(ms, "Call retrieve was rejected\n");
 449                 LOGP(DMNCC, LOGL_INFO, "Call retrieve was rejected\n");
 450                 break;
 451         default:
 452                 LOGP(DMNCC, LOGL_INFO, "Message 0x%02x unsupported\n",
 453                         msg_type);
 454                 return -EINVAL;
 455         }
 456
 457         return 0;
 458 }
 459
 460 int mncc_call(struct osmocom_ms *ms, char *number)
 461 {
 462         struct gsm_call *call;
 463         struct gsm_mncc setup;
 464
 465         llist_for_each_entry(call, &call_list, entry) {
 466                 if (!call->hold) {
 467                         vty_notify(ms, NULL);
 468                         vty_notify(ms, "Please put active call on hold "
 469                                 "first!\n");
 470                         LOGP(DMNCC, LOGL_INFO, "Cannot make a call, busy!\n");
 471                         return -EBUSY;
 472                 }
 473         }
 474
 475         call = talloc_zero(l23_ctx, struct gsm_call);
 476         if (!call)
 477                 return -ENOMEM;
 478         call->callref = new_callref++;
 479         call->init = 1;
 480         llist_add_tail(&call->entry, &call_list);
 481
 482         memset(&setup, 0, sizeof(struct gsm_mncc));
 483         setup.callref = call->callref;
 484
 485         if (!strncasecmp(number, "emerg", 5)) {
 486                 LOGP(DMNCC, LOGL_INFO, "Make emergency call\n");
 487                 /* emergency */
 488                 setup.emergency = 1;
 489         } else {
 490                 LOGP(DMNCC, LOGL_INFO, "Make call to %s\n", number);
 491                 /* called number */
 492                 setup.fields |= MNCC_F_CALLED;
 493                 if (number[0] == '+') {
 494                         number++;
 495                         setup.called.type = 1; /* international */
 496                 } else
 497                         setup.called.type = 0; /* auto/unknown - prefix must be
 498                                                   used */
 499                 setup.called.plan = 1; /* ISDN */
 500                 strncpy(setup.called.number, number,
 501                         sizeof(setup.called.number) - 1);
 502
 503                 /* bearer capability (mandatory) */
 504                 mncc_set_bearer(ms, -1, &setup);
 505                 if (ms->settings.clir)
 506                         setup.clir.sup = 1;
 507                 else if (ms->settings.clip)
 508                         setup.clir.inv = 1;
 509         }
 510
 511         return mncc_send(ms, MNCC_SETUP_REQ, &setup);
 512 }
 513
 514 int mncc_hangup(struct osmocom_ms *ms)
 515 {
 516         struct gsm_call *call, *found = NULL;
 517         struct gsm_mncc disc;
 518
 519         llist_for_each_entry(call, &call_list, entry) {
 520                 if (!call->hold) {
 521                         found = call;
 522                         break;
 523                 }
 524         }
 525         if (!found) {
 526                 LOGP(DMNCC, LOGL_INFO, "No active call to hangup\n");
 527                 vty_notify(ms, NULL);
 528                 vty_notify(ms, "No active call\n");
 529                 return -EINVAL;
 530         }
 531
 532         memset(&disc, 0, sizeof(struct gsm_mncc));
 533         disc.callref = found->callref;
 534         mncc_set_cause(&disc, GSM48_CAUSE_LOC_USER,
 535                 GSM48_CC_CAUSE_NORM_CALL_CLEAR);
 536         return mncc_send(ms, (call->init) ? MNCC_REL_REQ : MNCC_DISC_REQ,
 537                 &disc);
 538 }
 539
 540 int mncc_answer(struct osmocom_ms *ms)
 541 {
 542         struct gsm_call *call, *alerting = NULL;
 543         struct gsm_mncc rsp;
 544         int active = 0;
 545
 546         llist_for_each_entry(call, &call_list, entry) {
 547                 if (call->ring)
 548                         alerting = call;
 549                 else if (!call->hold)
 550                         active = 1;
 551         }
 552         if (!alerting) {
 553                 LOGP(DMNCC, LOGL_INFO, "No call alerting\n");
 554                 vty_notify(ms, NULL);
 555                 vty_notify(ms, "No alerting call\n");
 556                 return -EBUSY;
 557         }
 558         if (active) {
 559                 LOGP(DMNCC, LOGL_INFO, "Answer but we have an active call\n");
 560                 vty_notify(ms, NULL);
 561                 vty_notify(ms, "Please put active call on hold first!\n");
 562                 return -EBUSY;
 563         }
 564         alerting->ring = 0;
 565         alerting->hold = 0;
 566
 567         memset(&rsp, 0, sizeof(struct gsm_mncc));
 568         rsp.callref = alerting->callref;
 569         return mncc_send(ms, MNCC_SETUP_RSP, &rsp);
 570 }
 571
 572 int mncc_hold(struct osmocom_ms *ms)
 573 {
 574         struct gsm_call *call, *found = NULL;
 575         struct gsm_mncc hold;
 576
 577         llist_for_each_entry(call, &call_list, entry) {
 578                 if (!call->hold) {
 579                         found = call;
 580                         break;
 581                 }
 582         }
 583         if (!found) {
 584                 LOGP(DMNCC, LOGL_INFO, "No active call to hold\n");
 585                 vty_notify(ms, NULL);
 586                 vty_notify(ms, "No active call\n");
 587                 return -EINVAL;
 588         }
 589
 590         memset(&hold, 0, sizeof(struct gsm_mncc));
 591         hold.callref = found->callref;
 592         return mncc_send(ms, MNCC_HOLD_REQ, &hold);
 593 }
 594
 595 int mncc_retrieve(struct osmocom_ms *ms, int number)
 596 {
 597         struct gsm_call *call;
 598         struct gsm_mncc retr;
 599         int holdnum = 0, active = 0, i = 0;
 600
 601         llist_for_each_entry(call, &call_list, entry) {
 602                 if (call->hold)
 603                         holdnum++;
 604                 if (!call->hold)
 605                         active = 1;
 606         }
 607         if (active) {
 608                 LOGP(DMNCC, LOGL_INFO, "Cannot retrieve during active call\n");
 609                 vty_notify(ms, NULL);
 610                 vty_notify(ms, "Hold active call first!\n");
 611                 return -EINVAL;
 612         }
 613         if (holdnum == 0) {
 614                 vty_notify(ms, NULL);
 615                 vty_notify(ms, "No call on hold!\n");
 616                 return -EINVAL;
 617         }
 618         if (holdnum > 1 && number <= 0) {
 619                 vty_notify(ms, NULL);
 620                 vty_notify(ms, "Select call 1..%d\n", holdnum);
 621                 return -EINVAL;
 622         }
 623         if (holdnum == 1 && number <= 0)
 624                 number = 1;
 625         if (number > holdnum) {
 626                 vty_notify(ms, NULL);
 627                 vty_notify(ms, "Given number %d out of range!\n", number);
 628                 vty_notify(ms, "Select call 1..%d\n", holdnum);
 629                 return -EINVAL;
 630         }
 631
 632         llist_for_each_entry(call, &call_list, entry) {
 633                 i++;
 634                 if (i == number)
 635                         break;
 636         }
 637
 638         memset(&retr, 0, sizeof(struct gsm_mncc));
 639         retr.callref = call->callref;
 640         return mncc_send(ms, MNCC_RETRIEVE_REQ, &retr);
 641 }
 642
 643
 644
 645